I can't wait until next spring to bring this cacti back outside in the sun and use a good fertilizer mulch to get this plant to flower and grow some fruit.

Thank you! This has been an excellent help and I've learned so much about my cactus in only a few minutes of reading.

Okay now I'm not so sure about that link since the Latin name provided brings up different shaped and angled columns than my plant so I'll remain patient for some experts to reply.

Thanks.

I think I found it! Cereus hildmannianus seems like my species and I'm 99% sure the cacti in this picture is mine. http://en.wikipedia.org/wiki/Cereus_hildmannianus#mediaviewer/File:Cereus_hildmannianus_subsp._uruguayanus_-_Peruvian_Torch_Flowers.jpg" onclick="window.open(this.href);return...

One more picture..

Hi, I picked up a long spiny cacti specimen at a grocery store about 5 years ago and kept it in its original pot indoors where I live in Toronto Canada. I summer or two later I decided to take it outside in June and not too surprisingly it grew quickly so I re-potted it in a larger pot and repeated ...